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diff --git a/dom/media/mediasource/test/test_LoadedDataFired_mp4.html b/dom/media/mediasource/test/test_LoadedDataFired_mp4.html
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+++ b/dom/media/mediasource/test/test_LoadedDataFired_mp4.html
@@ -0,0 +1,57 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: Check that playback only starts once we have data at time = 0</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+  el.controls = true;
+  el.addEventListener("loadeddata", () => {
+    ok(el.buffered.length, "data is buffered");
+    is(el.buffered.start(0), 0, "must fire loadeddata when data has been loaded");
+    is(el.currentTime, 0, "must fire loadeddata at start");
+  });
+  el.addEventListener("playing", () => {
+    ok(el.buffered.length, "data is buffered");
+    is(el.buffered.start(0), 0, "must fire playing when data has been loaded");
+    ok(el.currentTime >= 0, "must have started playback");
+  });
+  await once(ms, "sourceopen");
+  ok(true, "Receive a sourceopen event");
+  const videosb = ms.addSourceBuffer("video/mp4");
+  is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
+  let p = once(el, "loadedmetadata");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+  await p;
+  videosb.appendWindowStart = 2;
+  videosb.appendWindowEnd = 4;
+  is(el.readyState, el.HAVE_METADATA, "readyState is HAVE_METADATA");
+  // Load [2.4, 3.968344). 2.4 as it's the first keyframe after 2s and
+  // 3.968344 as the last frame ends after 4s.
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 8), ".m4s");
+  is(el.readyState, el.HAVE_METADATA, "readyState is HAVE_METADATA");
+  // test that appendWindowEnd did its job.
+  ok(el.buffered.start(0) >= 2, "no data can be found prior appendWindowStart");
+  ok(el.buffered.end(el.buffered.length - 1) <= 4, "no data can be found beyond appendWindowEnd");
+  el.play();
+  await once(el, "play");
+  videosb.appendWindowStart = 0;
+  p = once(el, "playing");
+  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 8), ".m4s");
+  await p;
+  ok(true, "playing");
+  SimpleTest.finish();
+});
+
+</script>
+</pre>
+</body>
+</html>